Here to Serve doesn't provide an option to add a Maester character to your hand. You may look through your deck, and you must shuffle it, but that's all.

Barring the Gates does not prevent characters removed from the game by Mace Tyrell, Journey to Oldtown or Coldhands from returning to play. It's an expiration of a lasting effect, not an active "cause".

I interpret 'cause' as 'directly cause'. As in, the resolution of a card ability would result in a character entering play. Night Gathers doesn't put characters into play, so it doesn't directly cause characters to enter play. If you interpret 'cause' wider, as in 'without this ability you couldn't put this character into play', then you'd need to account for discounts and gold-generating abilities as well, no?
—
mplain1953/17/17

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